With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cagwDeletedFlows
Cisco's ASN Gateway Deleted Flows
1.3.6.1.4.1.9.9.638.1.3.1.1.1.6
The total number of flows deleted on this ASN-GW.
Back to CISCO-ASN-GATEWAY-MIB MIB page.
IPHost Network monitor allows you to monitor cagwDeletedFlows on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco multiplexers right now.